Fig. 27 Example Of The Signal Curve Of The Input Signal In The Operating Mode Two Channel Encoder Velocity Control - Beckhoff EP1908 Operating Instructions Manual

Operation
• Set the parameters Velocity limit channel x and Velocity limit channel y of the used channels to the
required value. The entered value has the unit 1/10 Hz.
Fig. 27: Example of the signal curve of the input signal in the operating mode Two Channel Encoder Velocity
Control
5.6.3.6 Configuration of the EP1908-0002 for mode Two Channel Async
Velocity Control
The TwinSAFE EtherCAT Box also supports direct connection of initiators and encoders for speed
measurement or frequency (24 V
The set mode Two Channel AsyncVelocity Control Channel x/y is used to determine a frequency from the
signals of an input pair of the EP1908-0002. In this mode is only the compliance with the limits for the two
channels is monitored. The upper limit frequencies are specified separately.
The two channels return logical 1 if both frequencies are below the frequency set under Velocity limit channel
x/y.
If the current frequency of the two channels is below the set limit frequency(Velocity limit channel x/y) for the
respective channel, the corresponding input pair returns a logical 1. If the current frequency of a channel is
above the set limit frequency for this channel, the corresponding input pair returns a logical 0.
The minimum supported frequency is 2 Hz. Values below this are shown as 0. The maximum supported
frequency is 500 Hz. Values above this result in a diagnostic messages of the EP1908-0002. This message
can be reset through a rising edge of the safe output signal ErrAck of the EP1908-0002.
Parameter
• Connect the signals of the used sensors to the input pairs
◦ 1 and 2,
◦ 3 and 4,
◦ 5 and 6 or
◦ 7 and 8
• Switch off the sensor test for the inputs used
(Sensor test Channel x active = FALSE)
• Set the parameter Logic of Channel x and y to
Two Channel Async Velocity Control Channel x/y
• Set the parameters Velocity limit channel x and Velocity limit channel y of the used channels to the
required value. The entered value has the unit 1/10 Hz.
44
).
DC
Version: 3.0.0 EP1908